1. J. N. Bhagwati and V. K. Ramaswami, ‘Domestic Distortions, Tariffs and the Theory of Optimum Subsidy’, Journal of Political Economy, Chicago, February 1963, pp. 44–50.
2. B. Balassa and M. Sharpston, Export Subsidies by Developing Countries: Issues of Policy (Geneva: Graduate Institute of International Studies, and London: Trade Policy Research Centre, 1977).
3. W. M. Corden, Trade Policy and Economic Welfare (Oxford: Clarendon Press, 1974).
4. R. Dornbusch, ‘Tariffs and Non-traded Goods’, Journal of International Economics, Amsterdam, May 1974, pp. 177–86.
5. I. A Mcdougall, ‘Non-traded Commodities and the Pure Theory of International Trade’, in McDougall and R. H. Snape (eds) Studies in International Economics (Amsterdam: North-Holland, 1970).